I don't know a ton about heat pumps, but a neighbor (who also owns his own HVAC business) checked ours out the other day and said that instead of blowing hot air out, it is sucking it in. He put a leaf on top of the unit and he said if it was working properly, the leaf should blow up...but, obviously, it sucked it in. He said we need to buy a new motor and a new blade, but we really don't have all that in our budget now. The unit itself is probably close to 20 years old (we've been there for only about 2 years). If we continue to let it work incorrectly, will there be serious isses? Thanks!